/**
 * Copyright 2009-2020 the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.logging.jdbc;

import org.apache.ibatis.logging.Log;
import org.apache.ibatis.reflection.ExceptionUtil;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * Statement proxy to add logging.
 *
 * @author Clinton Begin
 * @author Eduardo Macarron
 *
 */
public final class StatementLogger extends BaseJdbcLogger implements InvocationHandler {

	private final Statement statement;

	private StatementLogger(Statement stmt, Log statementLog, int queryStack) {
		super(statementLog, queryStack);
		this.statement = stmt;
	}

	/**
	 * Creates a logging version of a Statement.
	 *
	 * @param stmt
	 *          the statement
	 * @param statementLog
	 *          the statement log
	 * @param queryStack
	 *          the query stack
	 * @return the proxy
	 */
	public static Statement newInstance(Statement stmt, Log statementLog, int queryStack) {
		InvocationHandler handler = new StatementLogger(stmt, statementLog, queryStack);
		ClassLoader cl = Statement.class.getClassLoader();
		return (Statement) Proxy.newProxyInstance(cl, new Class[]{Statement.class}, handler);
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] params) throws Throwable {
		try {
			if (Object.class.equals(method.getDeclaringClass())) {
				return method.invoke(this, params);
			}
			if (EXECUTE_METHODS.contains(method.getName())) {
				if (isDebugEnabled()) {
					debug(" Executing: " + removeExtraWhitespace((String) params[0]), true);
				}
				if ("executeQuery".equals(method.getName())) {
					ResultSet rs = (ResultSet) method.invoke(statement, params);
					return rs == null ? null : ResultSetLogger.newInstance(rs, statementLog, queryStack);
				} else {
					return method.invoke(statement, params);
				}
			} else if ("getResultSet".equals(method.getName())) {
				ResultSet rs = (ResultSet) method.invoke(statement, params);
				return rs == null ? null : ResultSetLogger.newInstance(rs, statementLog, queryStack);
			} else {
				return method.invoke(statement, params);
			}
		} catch (Throwable t) {
			throw ExceptionUtil.unwrapThrowable(t);
		}
	}

	/**
	 * return the wrapped statement.
	 *
	 * @return the statement
	 */
	public Statement getStatement() {
		return statement;
	}

}
